The Royals placed Massey on the 7-day concussion injured list Thursday
Massey sat out Wednesday's game after he fell and hit his head while making a throw to first base during Tuesday's contest, and he'll officially remain out of action for at least a week after suffering a concussion. Tyler Tolbert figures to take over as Kansas City's primary second baseman while Massey is sidelined, and Josh Rojas will come up from Triple-A to replenish the team's infield depth.